Unico
primo
is a hybrid integrated stereo amplifier capable of delivering not less than 85W RMS
continuous on a 8ohm load with both the channels driver (as usual for UnisonResearch declared
power will be lower in order to keep our promises in every condition); with impulsive and not
correlate signals (i.e. a real musical signal) the maximum power will be even higher.
The prototyping phase has been passed, the “fine tuning” consisting in long hours of listening test is
done. After lots of sessions with different kind of music, different loudspeakers, different listeners
and a number of little modifications and part selections the final release is now on the way to
production lines.
Thoughts arisen some time ago, during the design of Reference power amplifier, induced the
UnisonResearch technical staff to deeply investigate the sonic performances of ECC83/12AX7
double triode in particular configurations. These investigations led the designer to the idea of using
this kind of triode in Unico line instead of ECC82/12AU7.
So we started a series of experiments on the on-production products, taking the best of our long
time experience and of the result of or tests.
Unico
primo
shares with UnicoP a design based on a single double triode, however in the new born
amplifier the input and preamplifier stage has been tailor suited on a ECC83/12AX7 tube (whose
characteristics are quite different from ECC82’s ones).
For the driver and power stages solutions long time tested in Unico amplifier has been implemented
even with some little improvement suggested by the experience matured working on the following
design.
Power supply has been revised increasing power transformer and filter capacitors in order to
improve dynamics, bass response, driving capability.
Just to make this little amp (it represents the entry level piece of Unico series) a well equipped
fighter against his competitors the design include a low impedance active stereo output dedicated to
an active subwoofer or any other line-level input and the option to convert one of the line input to a
phono input thanks to a easy to install RIAA preamplifier board.
The aesthetical line featuring black hairlined aluminium chassis give the Unico
primo
a smart and
sober looking, nice finishing of the surface and perfect proportions typical of an Italian style design.
The aluminium chassis ensures high rigidity too with improved sonic performances and spurious
vibrations dumping thanks to the three point suspension.
UnisonReasearch technical staff has put all its efforts in this project with the ambitious aim of
putting in a little amplifier all the knowledge, all the technology and all the passion they instil in the
top level award winning devices.
Technical characteristics
Output power: 85W RMS on 8
Frequency response: -0.1dB @ 10Hz, - 0.5dB @ 100kHz
Input stage: Pure A Class Tube stage (1 x ECC83/12AX7)
Output stage: Dynamic A Class POWER MOSFET complementary pair
Inputs: 5 line unbalanced (1 phono optional)
Line Outputs: 1 tape, 1 sub (volume controlled)
Outputs connectors: 4 + 4 bi-wiring
Power consumption: 340W max
Dimensions: 43.5cm x 9.5cm x 43cm
Net weight: 15kg
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